Textbook Question
How many molecular orbitals are present in the conduction band of a lithium crystal with a mass of 11.2 g?
749
views
Ch.12 - Solids and Modern Material
Chapter 12, Problem 64
A substance has a band gap of 0.85 eV at 273 K. Is this substance best classified as an insulator, a semiconductor, or a metal?
Verified step by step guidance1
Understand the concept of band gap: The band gap is the energy difference between the valence band and the conduction band in a material. It determines the electrical conductivity of the material.
Classify materials based on band gap: Metals have no band gap (or a very small one), semiconductors have a moderate band gap, and insulators have a large band gap.
Recall typical band gap values: Metals typically have a band gap of 0 eV, semiconductors have a band gap ranging from about 0.5 eV to 3 eV, and insulators have a band gap greater than 3 eV.
Compare the given band gap: The substance has a band gap of 0.85 eV, which falls within the range typical for semiconductors.
Conclude the classification: Based on the band gap value of 0.85 eV, classify the substance as a semiconductor.
Related Practice
Open Question
How many molecular orbitals are present in the valence band of a sodium crystal with a mass of 5.45 g?
Textbook Question
A substance has a band gap of 6.9 eV at 273 K. Is this substance best classified as an insulator, a semiconductor, or a metal?
426
views
Textbook Question
Indicate if each solid forms an n-type or a p-type semiconductor. a. germanium doped with gallium b. silicon doped with arsenic
Textbook Question
Does a photon of red light with a frequency of 4.29⨉1014 Hz have sufficient energy to promote an electron from the valence band to the conduction band in a sample of silicon (the band gap in silicon is 1.11 eV)?
467
views
Open Question
What is the wavelength of light (in nm) emitted when an electron moves from the conduction band to the valence band in a sample of diamond, which has a band gap of 5.5 eV?